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GtkSizeGroup groups widgets together so they all request the same size.

This is typically useful when you want a column of widgets to have the same size, but you can’t use a GtkGrid.

In detail, the size requested for each widget in a GtkSizeGroup is the maximum of the sizes that would have been requested for each widget in the size group if they were not in the size group. The mode of the size group (see [methodGtk.SizeGroup.set_mode]) determines whether this applies to the horizontal size, the vertical size, or both sizes.

Note that size groups only affect the amount of space requested, not the size that the widgets finally receive. If you want the widgets in a GtkSizeGroup to actually be the same size, you need to pack them in such a way that they get the size they request and not more.

GtkSizeGroup objects are referenced by each widget in the size group, so once you have added all widgets to a GtkSizeGroup, you can drop the initial reference to the size group with g_object_unref(). If the widgets in the size group are subsequently destroyed, then they will be removed from the size group and drop their references on the size group; when all widgets have been removed, the size group will be freed.

Widgets can be part of multiple size groups; GTK will compute the horizontal size of a widget from the horizontal requisition of all widgets that can be reached from the widget by a chain of size groups of type %GTK_SIZE_GROUP_HORIZONTAL or %GTK_SIZE_GROUP_BOTH, and the vertical size from the vertical requisition of all widgets that can be reached from the widget by a chain of size groups of type %GTK_SIZE_GROUP_VERTICAL or %GTK_SIZE_GROUP_BOTH.

Note that only non-contextual sizes of every widget are ever consulted by size groups (since size groups have no knowledge of what size a widget will be allocated in one dimension, it cannot derive how much height a widget will receive for a given width). When grouping widgets that trade height for width in mode %GTK_SIZE_GROUP_VERTICAL or %GTK_SIZE_GROUP_BOTH: the height for the minimum width will be the requested height for all widgets in the group. The same is of course true when horizontally grouping width for height widgets.

Widgets that trade height-for-width should set a reasonably large minimum width by way of [propertyGtk.Label:width-chars] for instance. Widgets with static sizes as well as widgets that grow (such as ellipsizing text) need no such considerations.

GtkSizeGroup as GtkBuildable

Size groups can be specified in a UI definition by placing an element with class="GtkSizeGroup" somewhere in the UI definition. The widgets that belong to the size group are specified by a element that may contain multiple elements, one for each member of the size group. The ”name” attribute gives the id of the widget.

An example of a UI definition fragment with GtkSizeGroup:

<object class="GtkSizeGroup">
<property name="mode">horizontal</property>
<widgets>
<widget name="radio1"/>
<widget name="radio2"/>
</widgets>
</object>

Hierarchy

Index

Constructors

Properties

g_type_instance: TypeInstance

The direction in which the size group affects requested sizes.

parent_instance: GObject.Object
name: string

Methods

  • Adds a widget to a GtkSizeGroup.

    In the future, the requisition of the widget will be determined as the maximum of its requisition and the requisition of the other widgets in the size group. Whether this applies horizontally, vertically, or in both directions depends on the mode of the size group. See [methodGtk.SizeGroup.set_mode].

    When the widget is destroyed or no longer referenced elsewhere, it will be removed from the size group.

    Parameters

    Returns void

  • Creates a binding between source_property on source and target_property on target.

    Whenever the source_property is changed the target_property is updated using the same value. For instance:

      g_object_bind_property (action, "active", widget, "sensitive", 0);
    

    Will result in the "sensitive" property of the widget #GObject instance to be updated with the same value of the "active" property of the action #GObject instance.

    If flags contains %G_BINDING_BIDIRECTIONAL then the binding will be mutual: if target_property on target changes then the source_property on source will be updated as well.

    The binding will automatically be removed when either the source or the target instances are finalized. To remove the binding without affecting the source and the target you can just call g_object_unref() on the returned #GBinding instance.

    Removing the binding by calling g_object_unref() on it must only be done if the binding, source and target are only used from a single thread and it is clear that both source and target outlive the binding. Especially it is not safe to rely on this if the binding, source or target can be finalized from different threads. Keep another reference to the binding and use g_binding_unbind() instead to be on the safe side.

    A #GObject can have multiple bindings.

    Parameters

    • source_property: string

      the property on source to bind

    • target: GObject.Object

      the target #GObject

    • target_property: string

      the property on target to bind

    • flags: BindingFlags

      flags to pass to #GBinding

    Returns Binding

  • Creates a binding between source_property on source and target_property on target, allowing you to set the transformation functions to be used by the binding.

    This function is the language bindings friendly version of g_object_bind_property_full(), using #GClosures instead of function pointers.

    Parameters

    • source_property: string

      the property on source to bind

    • target: GObject.Object

      the target #GObject

    • target_property: string

      the property on target to bind

    • flags: BindingFlags

      flags to pass to #GBinding

    • transform_to: TClosure<any, any>

      a #GClosure wrapping the transformation function from the source to the target, or %NULL to use the default

    • transform_from: TClosure<any, any>

      a #GClosure wrapping the transformation function from the target to the source, or %NULL to use the default

    Returns Binding

  • connect(sigName: "notify::mode", callback: (($obj: Gtk.SizeGroup, pspec: ParamSpec) => void)): number
  • connect(sigName: string, callback: ((...args: any[]) => void)): number
  • connect_after(sigName: "notify::mode", callback: (($obj: Gtk.SizeGroup, pspec: ParamSpec) => void)): number
  • connect_after(sigName: string, callback: ((...args: any[]) => void)): number
  • disconnect(id: number): void
  • emit(sigName: "notify::mode", ...args: any[]): void
  • emit(sigName: string, ...args: any[]): void
  • force_floating(): void
  • This function is intended for #GObject implementations to re-enforce a [floating][floating-ref] object reference. Doing this is seldom required: all #GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink().

    Returns void

  • freeze_notify(): void
  • Increases the freeze count on object. If the freeze count is non-zero, the emission of "notify" signals on object is stopped. The signals are queued until the freeze count is decreased to zero. Duplicate notifications are squashed so that at most one #GObject::notify signal is emitted for each property modified while the object is frozen.

    This is necessary for accessors that modify multiple properties to prevent premature notification while the object is still being modified.

    Returns void

  • get_buildable_id(): string
  • Gets the ID of the buildable object.

    GtkBuilder sets the name based on the ID attribute of the tag used to construct the buildable.

    Returns string

    • get_data(key?: string): object
    • Gets a named field from the objects table of associations (see g_object_set_data()).

      Parameters

      • Optional key: string

        name of the key for that association

      Returns object

    • get_property(property_name?: string, value?: any): void
    • Gets a property of an object.

      The value can be:

      • an empty #GValue initialized by %G_VALUE_INIT, which will be automatically initialized with the expected type of the property (since GLib 2.60)
      • a #GValue initialized with the expected type of the property
      • a #GValue initialized with a type to which the expected type of the property can be transformed

      In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset().

      Note that g_object_get_property() is really intended for language bindings, g_object_get() is much more convenient for C programming.

      Parameters

      • Optional property_name: string

        the name of the property to get

      • Optional value: any

        return location for the property value

      Returns void

    • get_qdata(quark: number): object
    • getv(names: string[], values: any[]): void
    • Gets n_properties properties for an object. Obtained properties will be set to values. All properties must be valid. Warnings will be emitted and undefined behaviour may result if invalid properties are passed in.

      Parameters

      • names: string[]

        the names of each property to get

      • values: any[]

        the values of each property to get

      Returns void

    • is_floating(): boolean
    • notify(property_name: string): void
    • Emits a "notify" signal for the property property_name on object.

      When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.

      Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.

      Parameters

      • property_name: string

        the name of a property installed on the class of object.

      Returns void

    • Emits a "notify" signal for the property specified by pspec on object.

      This function omits the property name lookup, hence it is faster than g_object_notify().

      One way to avoid using g_object_notify() from within the class that registered the properties, and using g_object_notify_by_pspec() instead, is to store the GParamSpec used with g_object_class_install_property() inside a static array, e.g.:

        enum
      {
      PROP_0,
      PROP_FOO,
      PROP_LAST
      };

      static GParamSpec *properties[PROP_LAST];

      static void
      my_object_class_init (MyObjectClass *klass)
      {
      properties[PROP_FOO] = g_param_spec_int ("foo", "Foo", "The foo",
      0, 100,
      50,
      G_PARAM_READWRITE);
      g_object_class_install_property (gobject_class,
      PROP_FOO,
      properties[PROP_FOO]);
      }

      and then notify a change on the "foo" property with:

        g_object_notify_by_pspec (self, properties[PROP_FOO]);
      

      Parameters

      • pspec: ParamSpec

        the #GParamSpec of a property installed on the class of object.

      Returns void

    • Increases the reference count of object.

      Since GLib 2.56, if GLIB_VERSION_MAX_ALLOWED is 2.56 or greater, the type of object will be propagated to the return type (using the GCC typeof() extension), so any casting the caller needs to do on the return type must be explicit.

      Returns GObject.Object

    • Increase the reference count of object, and possibly remove the [floating][floating-ref] reference, if object has a floating reference.

      In other words, if the object is floating, then this call "assumes ownership" of the floating reference, converting it to a normal reference by clearing the floating flag while leaving the reference count unchanged. If the object is not floating, then this call adds a new normal reference increasing the reference count by one.

      Since GLib 2.56, the type of object will be propagated to the return type under the same conditions as for g_object_ref().

      Returns GObject.Object

    • run_dispose(): void
    • Releases all references to other objects. This can be used to break reference cycles.

      This function should only be called from object system implementations.

      Returns void

    • set_data(key: string, data?: object): void
    • Each object carries around a table of associations from strings to pointers. This function lets you set an association.

      If the object already had an association with that name, the old association will be destroyed.

      Internally, the key is converted to a #GQuark using g_quark_from_string(). This means a copy of key is kept permanently (even after object has been finalized) — so it is recommended to only use a small, bounded set of values for key in your program, to avoid the #GQuark storage growing unbounded.

      Parameters

      • key: string

        name of the key

      • Optional data: object

        data to associate with that key

      Returns void

    • Sets the GtkSizeGroupMode of the size group.

      The mode of the size group determines whether the widgets in the size group should all have the same horizontal requisition (%GTK_SIZE_GROUP_HORIZONTAL) all have the same vertical requisition (%GTK_SIZE_GROUP_VERTICAL), or should all have the same requisition in both directions (%GTK_SIZE_GROUP_BOTH).

      Parameters

      Returns void

    • set_property(property_name: string, value?: any): void
    • steal_data(key?: string): object
    • Remove a specified datum from the object's data associations, without invoking the association's destroy handler.

      Parameters

      • Optional key: string

        name of the key

      Returns object

    • steal_qdata(quark: number): object
    • This function gets back user data pointers stored via g_object_set_qdata() and removes the data from object without invoking its destroy() function (if any was set). Usually, calling this function is only required to update user data pointers with a destroy notifier, for example:

      void
      object_add_to_user_list (GObject *object,
      const gchar *new_string)
      {
      // the quark, naming the object data
      GQuark quark_string_list = g_quark_from_static_string ("my-string-list");
      // retrieve the old string list
      GList *list = g_object_steal_qdata (object, quark_string_list);

      // prepend new string
      list = g_list_prepend (list, g_strdup (new_string));
      // this changed 'list', so we need to set it again
      g_object_set_qdata_full (object, quark_string_list, list, free_string_list);
      }
      static void
      free_string_list (gpointer data)
      {
      GList *node, *list = data;

      for (node = list; node; node = node->next)
      g_free (node->data);
      g_list_free (list);
      }

      Using g_object_get_qdata() in the above example, instead of g_object_steal_qdata() would have left the destroy function set, and thus the partial string list would have been freed upon g_object_set_qdata_full().

      Parameters

      • quark: number

        A #GQuark, naming the user data pointer

      Returns object

    • thaw_notify(): void
    • Reverts the effect of a previous call to g_object_freeze_notify(). The freeze count is decreased on object and when it reaches zero, queued "notify" signals are emitted.

      Duplicate notifications for each property are squashed so that at most one #GObject::notify signal is emitted for each property, in the reverse order in which they have been queued.

      It is an error to call this function when the freeze count is zero.

      Returns void

    • unref(): void
    • Decreases the reference count of object. When its reference count drops to 0, the object is finalized (i.e. its memory is freed).

      If the pointer to the #GObject may be reused in future (for example, if it is an instance variable of another object), it is recommended to clear the pointer to %NULL rather than retain a dangling pointer to a potentially invalid #GObject instance. Use g_clear_object() for this.

      Returns void

    • vfunc_constructed(): void
    • Similar to gtk_buildable_parser_finished() but is called once for each custom tag handled by the buildable.

      virtual

      Parameters

      • builder: Gtk.Builder

        a GtkBuilder

      • child: GObject.Object

        child object or %NULL for non-child tags

      • tagname: string

        the name of the tag

      • data: object

        user data created in custom_tag_start

      Returns void

    • Called at the end of each custom element handled by the buildable.

      virtual

      Parameters

      • builder: Gtk.Builder

        GtkBuilder used to construct this object

      • child: GObject.Object

        child object or %NULL for non-child tags

      • tagname: string

        name of tag

      • data: object

        user data that will be passed in to parser functions

      Returns void

    • vfunc_dispatch_properties_changed(n_pspecs: number, pspecs: ParamSpec): void
    • vfunc_dispose(): void
    • vfunc_finalize(): void
    • vfunc_get_id(): string
    • vfunc_get_property(property_id: number, value?: any, pspec?: ParamSpec): void
    • Emits a "notify" signal for the property property_name on object.

      When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.

      Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.

      virtual

      Parameters

      Returns void

    • vfunc_set_buildable_property(builder: Gtk.Builder, name: string, value: any): void
    • vfunc_set_id(id: string): void
    • vfunc_set_property(property_id: number, value?: any, pspec?: ParamSpec): void
    • watch_closure(closure: TClosure<any, any>): void
    • This function essentially limits the life time of the closure to the life time of the object. That is, when the object is finalized, the closure is invalidated by calling g_closure_invalidate() on it, in order to prevent invocations of the closure with a finalized (nonexisting) object. Also, g_object_ref() and g_object_unref() are added as marshal guards to the closure, to ensure that an extra reference count is held on object during invocation of the closure. Usually, this function will be called on closures that use this object as closure data.

      Parameters

      • closure: TClosure<any, any>

        #GClosure to watch

      Returns void

    • compat_control(what: number, data: object): number
    • Find the #GParamSpec with the given name for an interface. Generally, the interface vtable passed in as g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().

      Parameters

      • g_iface: TypeInterface

        any interface vtable for the interface, or the default vtable for the interface

      • property_name: string

        name of a property to look up.

      Returns ParamSpec

    • Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created #GParamSpec, but normally g_object_class_override_property() will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property.

      This function is meant to be called from the interface's default vtable initialization function (the class_init member of #GTypeInfo.) It must not be called after after class_init has been called for any object types implementing this interface.

      If pspec is a floating reference, it will be consumed.

      Parameters

      • g_iface: TypeInterface

        any interface vtable for the interface, or the default vtable for the interface.

      • pspec: ParamSpec

        the #GParamSpec for the new property

      Returns void

    • Lists the properties of an interface.Generally, the interface vtable passed in as g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().

      Parameters

      • g_iface: TypeInterface

        any interface vtable for the interface, or the default vtable for the interface

      Returns ParamSpec[]

    • Creates a new instance of a #GObject subtype and sets its properties.

      Construction parameters (see %G_PARAM_CONSTRUCT, %G_PARAM_CONSTRUCT_ONLY) which are not explicitly specified are set to their default values.

      Parameters

      • object_type: GType<unknown>

        the type id of the #GObject subtype to instantiate

      • parameters: GObject.Parameter[]

        an array of #GParameter

      Returns GObject.Object

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